Thanks for the information boys. I think I am expecting to much out of a spot calliper. We have a yearly safety test called the MOT. Hydraulic hand brakes will not pass this test.
There is however one company that has come up with a unique brake calliper that has a built-in hydraulic hand brake. According the manufactures, it will never release it's pressure.
It must be good because it will pass the MOT test and the SVA test. SVA is a stringent test that all kit cars have to pass in the UK just once, when the car is first registered.
They are expensive though at £250 each with tax (nearly $500)
http://www.hispecmotorsport.co.uk/calipers/handbrake_calipers.htm
Johnny
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